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(#) Using a method deprecated in earlier SDK

!!! WARNING: Using a method deprecated in earlier SDK
   This is a warning.

Id
:   `DeprecatedSinceApi`
Summary
:   Using a method deprecated in earlier SDK
Severity
:   Warning
Category
:   Correctness
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   7.3.0 (September 2022)
Affects
:   Kotlin and Java files
Editing
:   This check runs on the fly in the IDE editor
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/DeprecatedSinceApiDetector.kt)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/DeprecatedSinceApiDetectorTest.kt)

Some backport methods are only necessary until a specific version of
Android. These have been annotated with `@DeprecatedSinceApi`,
specifying the relevant API level and replacement suggestions. Calling
these methods when the `minSdkVersion` is already at the deprecated API
level or above is unnecessary.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
src/test/pkg/Test.kt:9:Warning: This method is deprecated as of API
level 21 [DeprecatedSinceApi]
    api.noLongerNecessary1(0) // WARN 1
    -------------------------
src/test/pkg/Test.kt:10:Warning: This method is deprecated as of API
level 23; Use AlarmManager.notify instead [DeprecatedSinceApi]
    api.noLongerNecessary2(0) // WARN 2
    -------------------------
src/test/pkg/Test.kt:11:Warning: This method is deprecated as of API
level 24 [DeprecatedSinceApi]
    api.noLongerNecessary3(0) // WARN 3
    -------------------------
src/test/pkg/Test.kt:18:Warning: This class is deprecated as of API
level 19 [DeprecatedSinceApi]
    val clz = Api2::class.java      // WARN 4
              -----------
src/test/pkg/Test.kt:19:Warning: This method is deprecated as of API
level 23 [DeprecatedSinceApi]
    val method1 = api2::someMethod1 // WARN 5
                  -----------------
src/test/pkg/Test.kt:20:Warning: This method is deprecated as of API
level 21 [DeprecatedSinceApi]
    val method2 = api2::someMethod2 // WARN 6
                  -----------------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here is the source file referenced above:

`src/test/pkg/Test.kt`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~kotlin linenumbers
@file:Suppress("UNUSED_PARAMETER", "UNUSED_VARIABLE", "unused")
package test.pkg
import androidx.annotation.DeprecatedSinceApi

class Test {
    fun test(api: Api, api2: Api2) {
        // minSdkVersion = 24:

        api.noLongerNecessary1(0) // WARN 1
        api.noLongerNecessary2(0) // WARN 2
        api.noLongerNecessary3(0) // WARN 3

        api.unnecessaryInTheFuture1(0) // OK 1
        api.unnecessaryInTheFuture2(0) // OK 2

        // The above enforced calls (the most common scenario); check
        // some other reference types.
        val clz = Api2::class.java      // WARN 4
        val method1 = api2::someMethod1 // WARN 5
        val method2 = api2::someMethod2 // WARN 6
    }
}

class Api {
    @DeprecatedSinceApi(api = 21)
    fun noLongerNecessary1(arg: Int) { }

    @DeprecatedSinceApi(api = 23, message = "Use AlarmManager.notify instead")
    fun noLongerNecessary2(arg: Int) { }

    @DeprecatedSinceApi(api = 24)
    fun noLongerNecessary3(arg: Int) { }

    @DeprecatedSinceApi(api = 25)
    fun unnecessaryInTheFuture1(arg: Int) { }

    @DeprecatedSinceApi(api = 33)
    fun unnecessaryInTheFuture2(arg: Int) { }
}

@DeprecatedSinceApi(api = 19)
class Api2 {
    @DeprecatedSinceApi(api = 23)
    fun someMethod1(arg: Int) { }
    @DeprecatedSinceApi(api = 21)
    fun someMethod2(arg: Int) { }
}

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/DeprecatedSinceApiDetectorTest.kt)
for the unit tests for this check to see additional scenarios.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Using a suppression annotation like this on the enclosing
  element:

  ```kt
  // Kotlin
  @Suppress("DeprecatedSinceApi")
  fun method() {
     problematicStatement()
  }
  ```

  or

  ```java
  // Java
  @SuppressWarnings("DeprecatedSinceApi")
  void method() {
     problematicStatement();
  }
  ```

* Using a suppression comment like this on the line above:

  ```kt
  //noinspection DeprecatedSinceApi
  problematicStatement()
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="DeprecatedSinceApi" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'DeprecatedSinceApi'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore DeprecatedSinceApi ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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